/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.swing.table;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.SwingPropertyChangeSupport;
import java.lang.Integer;
import java.awt.Color;
import java.awt.Component;
import java.io.Serializable;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

/**
 * A <code>TableColumn</code> represents all the attributes of a column in a
 * <code>JTable</code>, such as width, resizability, minimum and maximum width.
 * In addition, the <code>TableColumn</code> provides slots for a renderer and
 * an editor that can be used to display and edit the values in this column.
 * <p>
 * It is also possible to specify renderers and editors on a per type basis
 * rather than a per column basis - see the
 * <code>setDefaultRenderer</code> method in the <code>JTable</code> class.
 * This default mechanism is only used when the renderer (or
 * editor) in the <code>TableColumn</code> is <code>null</code>.
 * <p>
 * The <code>TableColumn</code> stores the link between the columns in the
 * <code>JTable</code> and the columns in the <code>TableModel</code>.
 * The <code>modelIndex</code> is the column in the
 * <code>TableModel</code>, which will be queried for the data values for the
 * cells in this column. As the column moves around in the view this
 * <code>modelIndex</code> does not change.
 * <p>
 * <b>Note:</b> Some implementations may assume that all
 * <code>TableColumnModel</code>s are unique, therefore we would
 * recommend that the same <code>TableColumn</code> instance
 * not be added more than once to a <code>TableColumnModel</code>.
 * To show <code>TableColumn</code>s with the same column of
 * data from the model, create a new instance with the same
 * <code>modelIndex</code>.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Alan Chung
 * @author Philip Milne
 * @see javax.swing.table.TableColumnModel
 * @see javax.swing.table.DefaultTableColumnModel
 * @see javax.swing.table.JTableHeader#getDefaultRenderer()
 * @see JTable#getDefaultRenderer(Class)
 * @see JTable#getDefaultEditor(Class)
 * @see JTable#getCellRenderer(int, int)
 * @see JTable#getCellEditor(int, int)
 */
public class TableColumn extends Object implements Serializable {

  /**
   * Obsolete as of Java 2 platform v1.3.  Please use string literals to identify
   * properties.
   */
    /*
     * Warning: The value of this constant, "columWidth" is wrong as the
     * name of the property is "columnWidth".
     */
  public final static String COLUMN_WIDTH_PROPERTY = "columWidth";

  /**
   * Obsolete as of Java 2 platform v1.3.  Please use string literals to identify
   * properties.
   */
  public final static String HEADER_VALUE_PROPERTY = "headerValue";

  /**
   * Obsolete as of Java 2 platform v1.3.  Please use string literals to identify
   * properties.
   */
  public final static String HEADER_RENDERER_PROPERTY = "headerRenderer";

  /**
   * Obsolete as of Java 2 platform v1.3.  Please use string literals to identify
   * properties.
   */
  public final static String CELL_RENDERER_PROPERTY = "cellRenderer";

//
//  Instance Variables
//

  /**
   * The index of the column in the model which is to be displayed by
   * this <code>TableColumn</code>. As columns are moved around in the
   * view <code>modelIndex</code> remains constant.
   */
  protected int modelIndex;

  /**
   * This object is not used internally by the drawing machinery of
   * the <code>JTable</code>; identifiers may be set in the
   * <code>TableColumn</code> as as an
   * optional way to tag and locate table columns. The table package does
   * not modify or invoke any methods in these identifier objects other
   * than the <code>equals</code> method which is used in the
   * <code>getColumnIndex()</code> method in the
   * <code>DefaultTableColumnModel</code>.
   */
  protected Object identifier;

  /**
   * The width of the column.
   */
  protected int width;

  /**
   * The minimum width of the column.
   */
  protected int minWidth;

  /**
   * The preferred width of the column.
   */
  private int preferredWidth;

  /**
   * The maximum width of the column.
   */
  protected int maxWidth;

  /**
   * The renderer used to draw the header of the column.
   */
  protected TableCellRenderer headerRenderer;

  /**
   * The header value of the column.
   */
  protected Object headerValue;

  /**
   * The renderer used to draw the data cells of the column.
   */
  protected TableCellRenderer cellRenderer;

  /**
   * The editor used to edit the data cells of the column.
   */
  protected TableCellEditor cellEditor;

  /**
   * If true, the user is allowed to resize the column; the default is true.
   */
  protected boolean isResizable;

  /**
   * This field was not used in previous releases and there are
   * currently no plans to support it in the future.
   *
   * @deprecated as of Java 2 platform v1.3
   */
    /*
     *  Counter used to disable posting of resizing notifications until the
     *  end of the resize.
     */
  @Deprecated
  transient protected int resizedPostingDisableCount;

  /**
   * If any <code>PropertyChangeListeners</code> have been registered, the
   * <code>changeSupport</code> field describes them.
   */
  private SwingPropertyChangeSupport changeSupport;

//
// Constructors
//

  /**
   * Cover method, using a default model index of 0,
   * default width of 75, a <code>null</code> renderer and a
   * <code>null</code> editor.
   * This method is intended for serialization.
   *
   * @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
   */
  public TableColumn() {
    this(0);
  }

  /**
   * Cover method, using a default width of 75, a <code>null</code>
   * renderer and a <code>null</code> editor.
   *
   * @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
   */
  public TableColumn(int modelIndex) {
    this(modelIndex, 75, null, null);
  }

  /**
   * Cover method, using a <code>null</code> renderer and a
   * <code>null</code> editor.
   *
   * @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
   */
  public TableColumn(int modelIndex, int width) {
    this(modelIndex, width, null, null);
  }

  /**
   * Creates and initializes an instance of
   * <code>TableColumn</code> with the specified model index,
   * width, cell renderer, and cell editor;
   * all <code>TableColumn</code> constructors delegate to this one.
   * The value of <code>width</code> is used
   * for both the initial and preferred width;
   * if <code>width</code> is negative,
   * they're set to 0.
   * The minimum width is set to 15 unless the initial width is less,
   * in which case the minimum width is set to
   * the initial width.
   *
   * <p>
   * When the <code>cellRenderer</code>
   * or <code>cellEditor</code> parameter is <code>null</code>,
   * a default value provided by the <code>JTable</code>
   * <code>getDefaultRenderer</code>
   * or <code>getDefaultEditor</code> method, respectively,
   * is used to
   * provide defaults based on the type of the data in this column.
   * This column-centric rendering strategy can be circumvented by overriding
   * the <code>getCellRenderer</code> methods in <code>JTable</code>.
   *
   * @param modelIndex the index of the column in the model that supplies the data for this column
   * in the table; the model index remains the same even when columns are reordered in the view
   * @param width this column's preferred width and initial width
   * @param cellRenderer the object used to render values in this column
   * @param cellEditor the object used to edit values in this column
   * @see #getMinWidth()
   * @see JTable#getDefaultRenderer(Class)
   * @see JTable#getDefaultEditor(Class)
   * @see JTable#getCellRenderer(int, int)
   * @see JTable#getCellEditor(int, int)
   */
  public TableColumn(int modelIndex, int width,
      TableCellRenderer cellRenderer,
      TableCellEditor cellEditor) {
    super();
    this.modelIndex = modelIndex;
    preferredWidth = this.width = Math.max(width, 0);

    this.cellRenderer = cellRenderer;
    this.cellEditor = cellEditor;

    // Set other instance variables to default values.
    minWidth = Math.min(15, this.width);
    maxWidth = Integer.MAX_VALUE;
    isResizable = true;
    resizedPostingDisableCount = 0;
    headerValue = null;
  }

//
// Modifying and Querying attributes
//

  private void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
    if (changeSupport != null) {
      changeSupport.firePropertyChange(propertyName, oldValue, newValue);
    }
  }

  private void firePropertyChange(String propertyName, int oldValue, int newValue) {
    if (oldValue != newValue) {
      firePropertyChange(propertyName, Integer.valueOf(oldValue), Integer.valueOf(newValue));
    }
  }

  private void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {
    if (oldValue != newValue) {
      firePropertyChange(propertyName, Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
    }
  }

  /**
   * Sets the model index for this column. The model index is the
   * index of the column in the model that will be displayed by this
   * <code>TableColumn</code>. As the <code>TableColumn</code>
   * is moved around in the view the model index remains constant.
   *
   * @param modelIndex the new modelIndex
   * @beaninfo bound: true description: The model index.
   */
  public void setModelIndex(int modelIndex) {
    int old = this.modelIndex;
    this.modelIndex = modelIndex;
    firePropertyChange("modelIndex", old, modelIndex);
  }

  /**
   * Returns the model index for this column.
   *
   * @return the <code>modelIndex</code> property
   */
  public int getModelIndex() {
    return modelIndex;
  }

  /**
   * Sets the <code>TableColumn</code>'s identifier to
   * <code>anIdentifier</code>. <p>
   * Note: identifiers are not used by the <code>JTable</code>,
   * they are purely a
   * convenience for the external tagging and location of columns.
   *
   * @param identifier an identifier for this column
   * @beaninfo bound: true description: A unique identifier for this column.
   * @see #getIdentifier
   */
  public void setIdentifier(Object identifier) {
    Object old = this.identifier;
    this.identifier = identifier;
    firePropertyChange("identifier", old, identifier);
  }


  /**
   * Returns the <code>identifier</code> object for this column.
   * Note identifiers are not used by <code>JTable</code>,
   * they are purely a convenience for external use.
   * If the <code>identifier</code> is <code>null</code>,
   * <code>getIdentifier()</code> returns <code>getHeaderValue</code>
   * as a default.
   *
   * @return the <code>identifier</code> property
   * @see #setIdentifier
   */
  public Object getIdentifier() {
    return (identifier != null) ? identifier : getHeaderValue();

  }

  /**
   * Sets the <code>Object</code> whose string representation will be
   * used as the value for the <code>headerRenderer</code>.  When the
   * <code>TableColumn</code> is created, the default <code>headerValue</code>
   * is <code>null</code>.
   *
   * @param headerValue the new headerValue
   * @beaninfo bound: true description: The text to be used by the header renderer.
   * @see #getHeaderValue
   */
  public void setHeaderValue(Object headerValue) {
    Object old = this.headerValue;
    this.headerValue = headerValue;
    firePropertyChange("headerValue", old, headerValue);
  }

  /**
   * Returns the <code>Object</code> used as the value for the header
   * renderer.
   *
   * @return the <code>headerValue</code> property
   * @see #setHeaderValue
   */
  public Object getHeaderValue() {
    return headerValue;
  }

  //
  // Renderers and Editors
  //

  /**
   * Sets the <code>TableCellRenderer</code> used to draw the
   * <code>TableColumn</code>'s header to <code>headerRenderer</code>.
   * <p>
   * It is the header renderers responsibility to render the sorting
   * indicator.  If you are using sorting and specify a renderer your
   * renderer must render the sorting indication.
   *
   * @param headerRenderer the new headerRenderer
   * @beaninfo bound: true description: The header renderer.
   * @see #getHeaderRenderer
   */
  public void setHeaderRenderer(TableCellRenderer headerRenderer) {
    TableCellRenderer old = this.headerRenderer;
    this.headerRenderer = headerRenderer;
    firePropertyChange("headerRenderer", old, headerRenderer);
  }

  /**
   * Returns the <code>TableCellRenderer</code> used to draw the header of the
   * <code>TableColumn</code>. When the <code>headerRenderer</code> is
   * <code>null</code>, the <code>JTableHeader</code>
   * uses its <code>defaultRenderer</code>. The default value for a
   * <code>headerRenderer</code> is <code>null</code>.
   *
   * @return the <code>headerRenderer</code> property
   * @see #setHeaderRenderer
   * @see #setHeaderValue
   * @see javax.swing.table.JTableHeader#getDefaultRenderer()
   */
  public TableCellRenderer getHeaderRenderer() {
    return headerRenderer;
  }

  /**
   * Sets the <code>TableCellRenderer</code> used by <code>JTable</code>
   * to draw individual values for this column.
   *
   * @param cellRenderer the new cellRenderer
   * @beaninfo bound: true description: The renderer to use for cell values.
   * @see #getCellRenderer
   */
  public void setCellRenderer(TableCellRenderer cellRenderer) {
    TableCellRenderer old = this.cellRenderer;
    this.cellRenderer = cellRenderer;
    firePropertyChange("cellRenderer", old, cellRenderer);
  }

  /**
   * Returns the <code>TableCellRenderer</code> used by the
   * <code>JTable</code> to draw
   * values for this column.  The <code>cellRenderer</code> of the column
   * not only controls the visual look for the column, but is also used to
   * interpret the value object supplied by the <code>TableModel</code>.
   * When the <code>cellRenderer</code> is <code>null</code>,
   * the <code>JTable</code> uses a default renderer based on the
   * class of the cells in that column. The default value for a
   * <code>cellRenderer</code> is <code>null</code>.
   *
   * @return the <code>cellRenderer</code> property
   * @see #setCellRenderer
   * @see JTable#setDefaultRenderer
   */
  public TableCellRenderer getCellRenderer() {
    return cellRenderer;
  }

  /**
   * Sets the editor to used by when a cell in this column is edited.
   *
   * @param cellEditor the new cellEditor
   * @beaninfo bound: true description: The editor to use for cell values.
   * @see #getCellEditor
   */
  public void setCellEditor(TableCellEditor cellEditor) {
    TableCellEditor old = this.cellEditor;
    this.cellEditor = cellEditor;
    firePropertyChange("cellEditor", old, cellEditor);
  }

  /**
   * Returns the <code>TableCellEditor</code> used by the
   * <code>JTable</code> to edit values for this column.  When the
   * <code>cellEditor</code> is <code>null</code>, the <code>JTable</code>
   * uses a default editor based on the
   * class of the cells in that column. The default value for a
   * <code>cellEditor</code> is <code>null</code>.
   *
   * @return the <code>cellEditor</code> property
   * @see #setCellEditor
   * @see JTable#setDefaultEditor
   */
  public TableCellEditor getCellEditor() {
    return cellEditor;
  }

  /**
   * This method should not be used to set the widths of columns in the
   * <code>JTable</code>, use <code>setPreferredWidth</code> instead.
   * Like a layout manager in the
   * AWT, the <code>JTable</code> adjusts a column's width automatically
   * whenever the
   * table itself changes size, or a column's preferred width is changed.
   * Setting widths programmatically therefore has no long term effect.
   * <p>
   * This method sets this column's width to <code>width</code>.
   * If <code>width</code> exceeds the minimum or maximum width,
   * it is adjusted to the appropriate limiting value.
   *
   * @param width the new width
   * @beaninfo bound: true description: The width of the column.
   * @see #getWidth
   * @see #setMinWidth
   * @see #setMaxWidth
   * @see #setPreferredWidth
   * @see JTable#doLayout()
   */
  public void setWidth(int width) {
    int old = this.width;
    this.width = Math.min(Math.max(width, minWidth), maxWidth);
    firePropertyChange("width", old, this.width);
  }

  /**
   * Returns the width of the <code>TableColumn</code>. The default width is
   * 75.
   *
   * @return the <code>width</code> property
   * @see #setWidth
   */
  public int getWidth() {
    return width;
  }

  /**
   * Sets this column's preferred width to <code>preferredWidth</code>.
   * If <code>preferredWidth</code> exceeds the minimum or maximum width,
   * it is adjusted to the appropriate limiting value.
   * <p>
   * For details on how the widths of columns in the <code>JTable</code>
   * (and <code>JTableHeader</code>) are calculated from the
   * <code>preferredWidth</code>,
   * see the <code>doLayout</code> method in <code>JTable</code>.
   *
   * @param preferredWidth the new preferred width
   * @beaninfo bound: true description: The preferred width of the column.
   * @see #getPreferredWidth
   * @see JTable#doLayout()
   */
  public void setPreferredWidth(int preferredWidth) {
    int old = this.preferredWidth;
    this.preferredWidth = Math.min(Math.max(preferredWidth, minWidth), maxWidth);
    firePropertyChange("preferredWidth", old, this.preferredWidth);
  }

  /**
   * Returns the preferred width of the <code>TableColumn</code>.
   * The default preferred width is 75.
   *
   * @return the <code>preferredWidth</code> property
   * @see #setPreferredWidth
   */
  public int getPreferredWidth() {
    return preferredWidth;
  }

  /**
   * Sets the <code>TableColumn</code>'s minimum width to
   * <code>minWidth</code>,
   * adjusting the new minimum width if necessary to ensure that
   * 0 &lt;= <code>minWidth</code> &lt;= <code>maxWidth</code>.
   * For example, if the <code>minWidth</code> argument is negative,
   * this method sets the <code>minWidth</code> property to 0.
   *
   * <p>
   * If the value of the
   * <code>width</code> or <code>preferredWidth</code> property
   * is less than the new minimum width,
   * this method sets that property to the new minimum width.
   *
   * @param minWidth the new minimum width
   * @beaninfo bound: true description: The minimum width of the column.
   * @see #getMinWidth
   * @see #setPreferredWidth
   * @see #setMaxWidth
   */
  public void setMinWidth(int minWidth) {
    int old = this.minWidth;
    this.minWidth = Math.max(Math.min(minWidth, maxWidth), 0);
    if (width < this.minWidth) {
      setWidth(this.minWidth);
    }
    if (preferredWidth < this.minWidth) {
      setPreferredWidth(this.minWidth);
    }
    firePropertyChange("minWidth", old, this.minWidth);
  }

  /**
   * Returns the minimum width for the <code>TableColumn</code>. The
   * <code>TableColumn</code>'s width can't be made less than this either
   * by the user or programmatically.
   *
   * @return the <code>minWidth</code> property
   * @see #setMinWidth
   * @see #TableColumn(int, int, TableCellRenderer, TableCellEditor)
   */
  public int getMinWidth() {
    return minWidth;
  }

  /**
   * Sets the <code>TableColumn</code>'s maximum width to
   * <code>maxWidth</code> or,
   * if <code>maxWidth</code> is less than the minimum width,
   * to the minimum width.
   *
   * <p>
   * If the value of the
   * <code>width</code> or <code>preferredWidth</code> property
   * is more than the new maximum width,
   * this method sets that property to the new maximum width.
   *
   * @param maxWidth the new maximum width
   * @beaninfo bound: true description: The maximum width of the column.
   * @see #getMaxWidth
   * @see #setPreferredWidth
   * @see #setMinWidth
   */
  public void setMaxWidth(int maxWidth) {
    int old = this.maxWidth;
    this.maxWidth = Math.max(minWidth, maxWidth);
    if (width > this.maxWidth) {
      setWidth(this.maxWidth);
    }
    if (preferredWidth > this.maxWidth) {
      setPreferredWidth(this.maxWidth);
    }
    firePropertyChange("maxWidth", old, this.maxWidth);
  }

  /**
   * Returns the maximum width for the <code>TableColumn</code>. The
   * <code>TableColumn</code>'s width can't be made larger than this
   * either by the user or programmatically.  The default maxWidth
   * is Integer.MAX_VALUE.
   *
   * @return the <code>maxWidth</code> property
   * @see #setMaxWidth
   */
  public int getMaxWidth() {
    return maxWidth;
  }

  /**
   * Sets whether this column can be resized.
   *
   * @param isResizable if true, resizing is allowed; otherwise false
   * @beaninfo bound: true description: Whether or not this column can be resized.
   * @see #getResizable
   */
  public void setResizable(boolean isResizable) {
    boolean old = this.isResizable;
    this.isResizable = isResizable;
    firePropertyChange("isResizable", old, this.isResizable);
  }

  /**
   * Returns true if the user is allowed to resize the
   * <code>TableColumn</code>'s
   * width, false otherwise. You can change the width programmatically
   * regardless of this setting.  The default is true.
   *
   * @return the <code>isResizable</code> property
   * @see #setResizable
   */
  public boolean getResizable() {
    return isResizable;
  }

  /**
   * Resizes the <code>TableColumn</code> to fit the width of its header cell.
   * This method does nothing if the header renderer is <code>null</code>
   * (the default case). Otherwise, it sets the minimum, maximum and preferred
   * widths of this column to the widths of the minimum, maximum and preferred
   * sizes of the Component delivered by the header renderer.
   * The transient "width" property of this TableColumn is also set to the
   * preferred width. Note this method is not used internally by the table
   * package.
   *
   * @see #setPreferredWidth
   */
  public void sizeWidthToFit() {
    if (headerRenderer == null) {
      return;
    }
    Component c = headerRenderer.getTableCellRendererComponent(null,
        getHeaderValue(), false, false, 0, 0);

    setMinWidth(c.getMinimumSize().width);
    setMaxWidth(c.getMaximumSize().width);
    setPreferredWidth(c.getPreferredSize().width);

    setWidth(getPreferredWidth());
  }

  /**
   * This field was not used in previous releases and there are
   * currently no plans to support it in the future.
   *
   * @deprecated as of Java 2 platform v1.3
   */
  @Deprecated
  public void disableResizedPosting() {
    resizedPostingDisableCount++;
  }

  /**
   * This field was not used in previous releases and there are
   * currently no plans to support it in the future.
   *
   * @deprecated as of Java 2 platform v1.3
   */
  @Deprecated
  public void enableResizedPosting() {
    resizedPostingDisableCount--;
  }

//
// Property Change Support
//

  /**
   * Adds a <code>PropertyChangeListener</code> to the listener list.
   * The listener is registered for all properties.
   * <p>
   * A <code>PropertyChangeEvent</code> will get fired in response to an
   * explicit call to <code>setFont</code>, <code>setBackground</code>,
   * or <code>setForeground</code> on the
   * current component.  Note that if the current component is
   * inheriting its foreground, background, or font from its
   * container, then no event will be fired in response to a
   * change in the inherited property.
   *
   * @param listener the listener to be added
   */
  public synchronized void addPropertyChangeListener(
      PropertyChangeListener listener) {
    if (changeSupport == null) {
      changeSupport = new SwingPropertyChangeSupport(this);
    }
    changeSupport.addPropertyChangeListener(listener);
  }

  /**
   * Removes a <code>PropertyChangeListener</code> from the listener list.
   * The <code>PropertyChangeListener</code> to be removed was registered
   * for all properties.
   *
   * @param listener the listener to be removed
   */

  public synchronized void removePropertyChangeListener(
      PropertyChangeListener listener) {
    if (changeSupport != null) {
      changeSupport.removePropertyChangeListener(listener);
    }
  }

  /**
   * Returns an array of all the <code>PropertyChangeListener</code>s added
   * to this TableColumn with addPropertyChangeListener().
   *
   * @return all of the <code>PropertyChangeListener</code>s added or an empty array if no listeners
   * have been added
   * @since 1.4
   */
  public synchronized PropertyChangeListener[] getPropertyChangeListeners() {
    if (changeSupport == null) {
      return new PropertyChangeListener[0];
    }
    return changeSupport.getPropertyChangeListeners();
  }

//
// Protected Methods
//

  /**
   * As of Java 2 platform v1.3, this method is not called by the <code>TableColumn</code>
   * constructor.  Previously this method was used by the
   * <code>TableColumn</code> to create a default header renderer.
   * As of Java 2 platform v1.3, the default header renderer is <code>null</code>.
   * <code>JTableHeader</code> now provides its own shared default
   * renderer, just as the <code>JTable</code> does for its cell renderers.
   *
   * @return the default header renderer
   * @see javax.swing.table.JTableHeader#createDefaultRenderer()
   */
  protected TableCellRenderer createDefaultHeaderRenderer() {
    DefaultTableCellRenderer label = new DefaultTableCellRenderer() {
      public Component getTableCellRendererComponent(JTable table, Object value,
          boolean isSelected, boolean hasFocus, int row, int column) {
        if (table != null) {
          JTableHeader header = table.getTableHeader();
          if (header != null) {
            setForeground(header.getForeground());
            setBackground(header.getBackground());
            setFont(header.getFont());
          }
        }

        setText((value == null) ? "" : value.toString());
        setBorder(UIManager.getBorder("TableHeader.cellBorder"));
        return this;
      }
    };
    label.setHorizontalAlignment(JLabel.CENTER);
    return label;
  }

} // End of class TableColumn
